Year	Percent
2000-01-01	56.875
2001-01-01	55.075
2002-01-01	52.875
2003-01-01	52.450
2004-01-01	53.150
2005-01-01	54.800
2006-01-01	56.600
2007-01-01	59.150
2008-01-01	61.750
2009-01-01	61.675
2010-01-01	60.875
2011-01-01	61.450
2012-01-01	61.550
2013-01-01	61.625
2014-01-01	62.750
2015-01-01	63.500
2016-01-01	64.750
2017-01-01	66.000